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    SubjectRe: Di-30 non working [bug 967]
    Date

    On Saturday 01 of November 2003 21:26, Stef van der Made wrote:
    > Do more people have issues with this drive. It might be nice to get this
    > working before the first 2.6.0 release .

    Please try with this patch applied.

    cheers,
    --bartlomiej


    [IDE] fix rq->flags use in ide-tape.c

    Noticed by Stuart_Hayes@Dell.com:

    I've noticed that, in the 2.6 (test 9) kernel, the "cmd" field (of type int)
    in struct request has been removed, and it looks like all of the code in
    ide-tape has just had a find & replace run on it to replace any instance of
    rq.cmd or rq->cmd with rq.flags or rq->flags.

    The values being put into "cmd" in 2.4 (now "flags", in 2.6) by ide-tape are
    8-bit numbers, like 90, 91, etc... and the actual flags that are being used
    in "flags" cover the low 23 bits. So, not only do the flags get wiped out
    when, say, ide-tape assigns, say, 90 to "flags", but also the 90 gets wiped
    out when one of the flags is modified.

    I noticed this, because ide-tape checks this value, and spews error codes
    when it isn't correct--continuously--as soon as you load the module, because
    ide-tape is calling ide_do_drive_cmd with an action of ide_preempt, which
    causes ide_do_drive_cmd to set the REQ_PREEMPT flag, so "flags" isn't the
    same when it gets back to idetape_do_request.

    drivers/ide/ide-tape.c | 193 ++++++++++++++++++++-----------------------------
    include/linux/blkdev.h | 10 ++
    2 files changed, 90 insertions(+), 113 deletions(-)

    diff -puN drivers/ide/ide-tape.c~ide-tape-rq_flags-fix drivers/ide/ide-tape.c
    --- linux-2.6.0-test9/drivers/ide/ide-tape.c~ide-tape-rq_flags-fix 2003-11-01 22:18:18.715178960 +0100
    +++ linux-2.6.0-test9-root/drivers/ide/ide-tape.c 2003-11-01 22:18:18.727177136 +0100
    @@ -1210,34 +1210,11 @@ typedef struct {
    * In order to service a character device command, we add special
    * requests to the tail of our block device request queue and wait
    * for their completion.
    - *
    - */
    -#define IDETAPE_FIRST_RQ 90
    -
    -/*
    - * IDETAPE_PC_RQ is used to queue a packet command in the request queue.
    - */
    -#define IDETAPE_PC_RQ1 90
    -#define IDETAPE_PC_RQ2 91
    -
    -/*
    - * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our
    - * character device interface to request read/write operations from
    - * our block device interface.
    - */
    -#define IDETAPE_READ_RQ 92
    -#define IDETAPE_WRITE_RQ 93
    -#define IDETAPE_ABORTED_WRITE_RQ 94
    -#define IDETAPE_ABORTED_READ_RQ 95
    -#define IDETAPE_READ_BUFFER_RQ 96
    -
    -#define IDETAPE_LAST_RQ 96
    -
    -/*
    - * A macro which can be used to check if a we support a given
    - * request command.
    */
    -#define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ))
    +#define idetape_request(rq) \
    + ((rq)->flags & (REQ_IDETAPE_PC1 | REQ_IDETAPE_PC2 | \
    + REQ_IDETAPE_READ | REQ_IDETAPE_WRITE | \
    + REQ_IDETAPE_READ_BUFFER))

    /*
    * Error codes which are returned in rq->errors to the higher part
    @@ -1891,7 +1868,7 @@ static int idetape_end_request(ide_drive
    tape->active_stage = NULL;
    tape->active_data_request = NULL;
    tape->nr_pending_stages--;
    - if (rq->flags == IDETAPE_WRITE_RQ) {
    + if (rq->flags & REQ_IDETAPE_WRITE) {
    #if ONSTREAM_DEBUG
    if (tape->debug_level >= 2) {
    if (tape->onstream) {
    @@ -1937,7 +1914,7 @@ static int idetape_end_request(ide_drive
    }
    }
    }
    - } else if (rq->flags == IDETAPE_READ_RQ) {
    + } else if (rq->flags & REQ_IDETAPE_READ) {
    if (error == IDETAPE_ERROR_EOD) {
    set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
    idetape_abort_pipeline(drive, active_stage);
    @@ -2018,7 +1995,7 @@ static void idetape_queue_pc_head (ide_d
    {
    ide_init_drive_cmd(rq);
    rq->buffer = (char *) pc;
    - rq->flags = IDETAPE_PC_RQ1;
    + rq->flags |= REQ_IDETAPE_PC1;
    (void) ide_do_drive_cmd(drive, rq, ide_preempt);
    }

    @@ -2711,7 +2688,7 @@ static ide_startstop_t idetape_do_reques
    struct request *rq, sector_t block)
    {
    idetape_tape_t *tape = drive->driver_data;
    - idetape_pc_t *pc;
    + idetape_pc_t *pc = NULL;
    struct request *postponed_rq = tape->postponed_rq;
    atapi_status_t status;

    @@ -2728,7 +2705,7 @@ static ide_startstop_t idetape_do_reques
    rq->sector, rq->nr_sectors, rq->current_nr_sectors);
    #endif /* IDETAPE_DEBUG_LOG */

    - if (!IDETAPE_RQ_CMD(rq->flags)) {
    + if (!idetape_request(rq)) {
    /*
    * We do not support buffer cache originated requests.
    */
    @@ -2769,7 +2746,7 @@ static ide_startstop_t idetape_do_reques
    */
    if (tape->onstream)
    status.b.dsc = 1;
    - if (!drive->dsc_overlap && rq->flags != IDETAPE_PC_RQ2)
    + if (!drive->dsc_overlap && !(rq->flags & REQ_IDETAPE_PC2))
    set_bit(IDETAPE_IGNORE_DSC, &tape->flags);

    /*
    @@ -2783,7 +2760,7 @@ static ide_startstop_t idetape_do_reques
    if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
    tape->measure_insert_time = 1;
    if (tape->req_buffer_fill &&
    - (rq->flags == IDETAPE_WRITE_RQ || rq->flags == IDETAPE_READ_RQ)) {
    + (rq->flags & (REQ_IDETAPE_WRITE | REQ_IDETAPE_READ))) {
    tape->req_buffer_fill = 0;
    tape->writes_since_buffer_fill = 0;
    tape->reads_since_buffer_fill = 0;
    @@ -2797,12 +2774,12 @@ static ide_startstop_t idetape_do_reques
    tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
    calculate_speeds(drive);
    if (tape->onstream && tape->max_frames &&
    - ((rq->flags == IDETAPE_WRITE_RQ &&
    + (((rq->flags & REQ_IDETAPE_WRITE) &&
    ( tape->cur_frames == tape->max_frames ||
    ( tape->speed_control && tape->cur_frames > 5 &&
    (tape->insert_speed > tape->max_insert_speed ||
    (0 /* tape->cur_frames > 30 && tape->tape_still_time > 200 */) ) ) ) ) ||
    - (rq->flags == IDETAPE_READ_RQ &&
    + ((rq->flags & REQ_IDETAPE_READ) &&
    ( tape->cur_frames == 0 ||
    ( tape->speed_control && (tape->cur_frames < tape->max_frames - 5) &&
    tape->insert_speed > tape->max_insert_speed ) ) && rq->nr_sectors) ) ) {
    @@ -2831,7 +2808,7 @@ static ide_startstop_t idetape_do_reques
    } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) {
    printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
    tape->name);
    - if (rq->flags == IDETAPE_PC_RQ2) {
    + if (rq->flags & REQ_IDETAPE_PC2) {
    idetape_media_access_finished(drive);
    return ide_stopped;
    } else {
    @@ -2842,69 +2819,59 @@ static ide_startstop_t idetape_do_reques
    idetape_postpone_request(drive);
    return ide_stopped;
    }
    - switch (rq->flags) {
    - case IDETAPE_READ_RQ:
    - tape->buffer_head++;
    + if (rq->flags & REQ_IDETAPE_READ) {
    + tape->buffer_head++;
    #if USE_IOTRACE
    - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
    + IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
    #endif
    - tape->postpone_cnt = 0;
    - tape->reads_since_buffer_fill++;
    - if (tape->onstream) {
    - if (tape->cur_frames - tape->reads_since_buffer_fill <= 0)
    - tape->req_buffer_fill = 1;
    - if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100))
    - tape->req_buffer_fill = 1;
    - }
    - pc = idetape_next_pc_storage(drive);
    - idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    - break;
    - case IDETAPE_WRITE_RQ:
    - tape->buffer_head++;
    + tape->postpone_cnt = 0;
    + tape->reads_since_buffer_fill++;
    + if (tape->onstream) {
    + if (tape->cur_frames - tape->reads_since_buffer_fill <= 0)
    + tape->req_buffer_fill = 1;
    + if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100))
    + tape->req_buffer_fill = 1;
    + }
    + pc = idetape_next_pc_storage(drive);
    + idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    + goto out;
    + }
    + if (rq->flags & REQ_IDETAPE_WRITE) {
    + tape->buffer_head++;
    #if USE_IOTRACE
    - IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
    -#endif
    - tape->postpone_cnt = 0;
    - tape->writes_since_buffer_fill++;
    - if (tape->onstream) {
    - if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames)
    - tape->req_buffer_fill = 1;
    - if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100))
    - tape->req_buffer_fill = 1;
    - calculate_speeds(drive);
    - }
    - pc = idetape_next_pc_storage(drive);
    - idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    - break;
    - case IDETAPE_READ_BUFFER_RQ:
    - tape->postpone_cnt = 0;
    - pc = idetape_next_pc_storage(drive);
    - idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    - break;
    - case IDETAPE_ABORTED_WRITE_RQ:
    - rq->flags = IDETAPE_WRITE_RQ;
    - idetape_end_request(drive, IDETAPE_ERROR_EOD, 0);
    - return ide_stopped;
    - case IDETAPE_ABORTED_READ_RQ:
    -#if IDETAPE_DEBUG_LOG
    - if (tape->debug_level >= 2)
    - printk(KERN_INFO "ide-tape: %s: detected aborted read rq\n", tape->name);
    + IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
    #endif
    - rq->flags = IDETAPE_READ_RQ;
    - idetape_end_request(drive, IDETAPE_ERROR_EOD, 0);
    - return ide_stopped;
    - case IDETAPE_PC_RQ1:
    - pc = (idetape_pc_t *) rq->buffer;
    - rq->flags = IDETAPE_PC_RQ2;
    - break;
    - case IDETAPE_PC_RQ2:
    - idetape_media_access_finished(drive);
    - return ide_stopped;
    - default:
    - printk(KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n");
    - idetape_end_request(drive, 0, 0);
    - return ide_stopped;
    + tape->postpone_cnt = 0;
    + tape->writes_since_buffer_fill++;
    + if (tape->onstream) {
    + if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames)
    + tape->req_buffer_fill = 1;
    + if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100))
    + tape->req_buffer_fill = 1;
    + calculate_speeds(drive);
    + }
    + pc = idetape_next_pc_storage(drive);
    + idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    + goto out;
    + }
    + if (rq->flags & REQ_IDETAPE_READ_BUFFER) {
    + tape->postpone_cnt = 0;
    + pc = idetape_next_pc_storage(drive);
    + idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
    + goto out;
    + }
    + if (rq->flags & REQ_IDETAPE_PC1) {
    + pc = (idetape_pc_t *) rq->buffer;
    + rq->flags &= ~(REQ_IDETAPE_PC1);
    + rq->flags |= REQ_IDETAPE_PC2;
    + goto out;
    + }
    + if (rq->flags & REQ_IDETAPE_PC2) {
    + idetape_media_access_finished(drive);
    + return ide_stopped;
    }
    + BUG();
    +out:
    return idetape_issue_packet_command(drive, pc);
    }

    @@ -3196,7 +3163,7 @@ static void idetape_wait_for_request (id
    idetape_tape_t *tape = drive->driver_data;

    #if IDETAPE_DEBUG_BUGS
    - if (rq == NULL || !IDETAPE_RQ_CMD(rq->flags)) {
    + if (rq == NULL || !idetape_request(rq)) {
    printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
    return;
    }
    @@ -3304,7 +3271,7 @@ static int __idetape_queue_pc_tail (ide_

    ide_init_drive_cmd(&rq);
    rq.buffer = (char *) pc;
    - rq.flags = IDETAPE_PC_RQ1;
    + rq.flags |= REQ_IDETAPE_PC1;
    return ide_do_drive_cmd(drive, &rq, ide_wait);
    }

    @@ -3581,14 +3548,14 @@ static int idetape_queue_rw_tail(ide_dri

    ide_init_drive_cmd(&rq);
    rq.special = (void *)bh;
    - rq.flags = cmd;
    + rq.flags |= cmd;
    rq.sector = tape->first_frame_position;
    rq.nr_sectors = rq.current_nr_sectors = blocks;
    if (tape->onstream)
    tape->postpone_cnt = 600;
    (void) ide_do_drive_cmd(drive, &rq, ide_wait);

    - if (cmd != IDETAPE_READ_RQ && cmd != IDETAPE_WRITE_RQ)
    + if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
    return 0;

    if (tape->merge_stage)
    @@ -3623,14 +3590,14 @@ static void idetape_onstream_read_back_b
    first = stage;
    aux = stage->aux;
    p = stage->bh->b_data;
    - idetape_queue_rw_tail(drive, IDETAPE_READ_BUFFER_RQ, tape->capabilities.ctl, stage->bh);
    + idetape_queue_rw_tail(drive, REQ_IDETAPE_READ_BUFFER, tape->capabilities.ctl, stage->bh);
    #if ONSTREAM_DEBUG
    if (tape->debug_level >= 2)
    printk(KERN_INFO "ide-tape: %s: read back logical block %d, data %x %x %x %x\n", tape->name, logical_blk_num, *p++, *p++, *p++, *p++);
    #endif
    rq = &stage->rq;
    ide_init_drive_cmd(rq);
    - rq->flags = IDETAPE_WRITE_RQ;
    + rq->flags |= REQ_IDETAPE_WRITE;
    rq->sector = tape->first_frame_position;
    rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl;
    idetape_init_stage(drive, stage, OS_FRAME_TYPE_DATA, logical_blk_num++);
    @@ -3900,12 +3867,12 @@ static int idetape_add_chrdev_write_requ
    * Linux is short on memory. Fallback to
    * non-pipelined operation mode for this request.
    */
    - return idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
    + return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
    }
    }
    rq = &new_stage->rq;
    ide_init_drive_cmd(rq);
    - rq->flags = IDETAPE_WRITE_RQ;
    + rq->flags |= REQ_IDETAPE_WRITE;
    /* Doesn't actually matter - We always assume sequential access */
    rq->sector = tape->first_frame_position;
    rq->nr_sectors = rq->current_nr_sectors = blocks;
    @@ -4093,7 +4060,7 @@ static int idetape_initiate_read (ide_dr
    * is switched from completion mode to buffer available
    * mode.
    */
    - bytes_read = idetape_queue_rw_tail(drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bh);
    + bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
    if (bytes_read < 0) {
    __idetape_kfree_stage(tape->merge_stage);
    tape->merge_stage = NULL;
    @@ -4104,7 +4071,7 @@ static int idetape_initiate_read (ide_dr
    if (tape->restart_speed_control_req)
    idetape_restart_speed_control(drive);
    ide_init_drive_cmd(&rq);
    - rq.flags = IDETAPE_READ_RQ;
    + rq.flags |= REQ_IDETAPE_READ;
    rq.sector = tape->first_frame_position;
    rq.nr_sectors = rq.current_nr_sectors = blocks;
    if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
    @@ -4242,7 +4209,7 @@ static int idetape_add_chrdev_read_reque
    }
    if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
    return 0;
    - return idetape_queue_rw_tail(drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bh);
    + return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
    }
    rq_ptr = &tape->first_stage->rq;
    bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
    @@ -4308,7 +4275,7 @@ static void idetape_pad_zeros (ide_drive
    count -= atomic_read(&bh->b_count);
    bh = bh->b_reqnext;
    }
    - idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
    + idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
    }
    }

    @@ -4788,7 +4755,7 @@ static void idetape_update_last_marker (
    "tape block %d\n", tape->last_frame_position);
    #endif
    idetape_position_tape(drive, last_mark_addr, 0, 0);
    - if (!idetape_queue_rw_tail(drive, IDETAPE_READ_RQ, 1, stage->bh)) {
    + if (!idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1, stage->bh)) {
    printk(KERN_INFO "ide-tape: %s: couldn't read last marker\n",
    tape->name);
    __idetape_kfree_stage(stage);
    @@ -4809,7 +4776,7 @@ static void idetape_update_last_marker (
    #endif
    aux->next_mark_addr = htonl(next_mark_addr);
    idetape_position_tape(drive, last_mark_addr, 0, 0);
    - if (!idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, 1, stage->bh)) {
    + if (!idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1, stage->bh)) {
    printk(KERN_INFO "ide-tape: %s: couldn't write back marker "
    "frame at %d\n", tape->name, last_mark_addr);
    __idetape_kfree_stage(stage);
    @@ -4845,7 +4812,7 @@ static void idetape_write_filler (ide_dr

    strcpy(stage->bh->b_data, "Filler");
    while (cnt--) {
    - if (!idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, 1, stage->bh)) {
    + if (!idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1, stage->bh)) {
    printk(KERN_INFO "ide-tape: %s: write_filler: "
    "couldn't write header frame\n", tape->name);
    __idetape_kfree_stage(stage);
    @@ -4880,7 +4847,7 @@ static void __idetape_write_header (ide_
    header.partition.eod_frame_addr = htonl(tape->eod_frame_addr);
    memcpy(stage->bh->b_data, &header, sizeof(header));
    while (cnt--) {
    - if (!idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, 1, stage->bh)) {
    + if (!idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1, stage->bh)) {
    printk(KERN_INFO "ide-tape: %s: couldn't write "
    "header frame\n", tape->name);
    __idetape_kfree_stage(stage);
    @@ -5013,7 +4980,7 @@ static ssize_t idetape_chrdev_write (str
    * is switched from completion mode to buffer available
    * mode.
    */
    - retval = idetape_queue_rw_tail(drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bh);
    + retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
    if (retval < 0) {
    __idetape_kfree_stage(tape->merge_stage);
    tape->merge_stage = NULL;
    @@ -5487,7 +5454,7 @@ static int __idetape_analyze_headers (id
    printk(KERN_INFO "ide-tape: %s: reading header\n", tape->name);
    #endif
    idetape_position_tape(drive, block, 0, 0);
    - if (!idetape_queue_rw_tail(drive, IDETAPE_READ_RQ, 1, stage->bh)) {
    + if (!idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1, stage->bh)) {
    printk(KERN_INFO "ide-tape: %s: couldn't read header frame\n",
    tape->name);
    __idetape_kfree_stage(stage);
    diff -puN include/linux/blkdev.h~ide-tape-rq_flags-fix include/linux/blkdev.h
    --- linux-2.6.0-test9/include/linux/blkdev.h~ide-tape-rq_flags-fix 2003-11-01 22:18:18.718178504 +0100
    +++ linux-2.6.0-test9-root/include/linux/blkdev.h 2003-11-01 22:18:18.732176376 +0100
    @@ -193,6 +193,11 @@ enum rq_flag_bits {
    __REQ_PM_SUSPEND, /* suspend request */
    __REQ_PM_RESUME, /* resume request */
    __REQ_PM_SHUTDOWN, /* shutdown request */
    + __REQ_IDETAPE_PC1, /* packet command (first stage) */
    + __REQ_IDETAPE_PC2, /* packet command (second stage) */
    + __REQ_IDETAPE_READ,
    + __REQ_IDETAPE_WRITE,
    + __REQ_IDETAPE_READ_BUFFER,
    __REQ_NR_BITS, /* stops here */
    };

    @@ -218,6 +223,11 @@ enum rq_flag_bits {
    #define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND)
    #define REQ_PM_RESUME (1 << __REQ_PM_RESUME)
    #define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN)
    +#define REQ_IDETAPE_PC1 (1 << __REQ_IDETAPE_PC1)
    +#define REQ_IDETAPE_PC2 (1 << __REQ_IDETAPE_PC2)
    +#define REQ_IDETAPE_READ (1 << __REQ_IDETAPE_READ)
    +#define REQ_IDETAPE_WRITE (1 << __REQ_IDETAPE_WRITE)
    +#define REQ_IDETAPE_READ_BUFFER (1 << __REQ_IDETAPE_READ_BUFFER)

    /*
    * State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME
    _

    -
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